Labyrinth of Fire picks up the baton left by the first book in the series, Island of Fog. While the characters and the style remain the same, Labyrinth is a very different book to its predecessor. Gone are the Blyton-esque mysteries and intrigue, and the childlike inquisitiveness, of the first book, replaced by a more serious, focused set of characters. It's clear the children have had to grow up in a hurry, a necessity born from the demands of a new world, new abilities and new responsibilities, and all the dangers they bring. As a result, friendships, relationships and personalities blossom as they are forced to use their shapeshifting abilities to work together as a team in much the same way as the cogs in a clock.
There's a whole slew of new characters and creatures to delve into, from an ornery centaur leader to a shapeshifting griffin to a fiercely proud dragon, and there is much to learn of the ways and customs of Elsewhere, including the mysterious geo-rocks that provide power to the myriad machines and devices of the human-folk. An unfortunate but unavoidable side-effect of this ground-laying work is that the opening third doesn't quite engage in the same way that Island of Fog did, but the final half more than makes up for it with no lack of drama, gathering pace and momentum which leads to the book's final shocking revelation.
In all then, this is a worthy follow-up to Island of Fog and in its flow proves hard to put down, offering natural progression and leaving you waiting impatiently for its upcoming third installment...